Don't Think About This Scarlet & Violet Paradox Pokémon Exclusion Too Hard

screenrant.com:

Despite now having a Paradox Pokémon for all but one type, it is better not to dwell too much on why this type was excluded. Paradox Pokémon are a welcome and interesting addition to the series, showing players how certain Pokémon would look in the past or future. Even though they will likely be left behind when the next generation comes around, their presence in the series won't be forgotten. However, this begs the question of why one specific type was left out, even if its answer is simple.

Though it is disappointing that Paradox forms followed the recent trend of title-exclusive Pokémon, both did a good job of adding more Paradox Pokémon in the DLCs. added in past forms of the Legendary Beasts from Johto, while received future forms of the Swords of Justice from Unova. Every Paradox form was also a dual type, which makes it strange that one type was never added at all.

Normal was the one type not used by any Paradox Pokémon currently known in the series. This may not be the biggest loss since the type has few strengths, but it is still an odd thing to be the sole type unused. So far, the most agreed-upon theory is due to the Normal-type not being special enough to warrant use on a Paradox Pokémon. This makes the most sense, since the first three to four generations had rather everyday creatures using the type.

This trend has mostly continued since, but some outliers have existed, like Porygon. This sort of precedent has somewhat opened the door for Normal-type to be used for Pokémon like Porygon that don't fit any of the other types. Regardless, the idea that Normal-type is not special enough fits the answer and doesn't overcomplicate things. However, this is not the only theory as to why this one type was excluded from Paradox forms.

Though more complicated and not as concrete, the other popular theory as to why Normal-type is missing from Paradox forms is due to animal evolution. Since Normal-type is mainly used for everyday animals, especially mammals, it